#include <stdio.h>
#include <math.h>

int main()
{
    double pi = 3.14;
    double r, h;
    scanf("%lf %lf", &h, &r);
    int num = 0;
    num = ceil((1000 * 20) / (pi * r * r * h));
    printf("%d", num);

    return 0;
}